<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>Violation in Unpolarized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo></mml:math>Charginos at One-Loop Level

Osland, P.; Vereshagin, A.

doi:10.1103/physrevd.76.036001

Cited by 12 publications

(3 citation statements)

References 57 publications

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“…Loopinduced CP-violating effects have been studied in refs. [82,83], in particular the effect of complex parameters on certain asymmetries, but the considered quantities were UV finite and therefore did not require renormalisation. We extend the previous results to the general case of complex parameters.…”

Section: Jhep05(2013)053mentioning

confidence: 99%

Consistent on shell renormalisation of electroweakinos in the complex MSSM: LHC and LC predictions

Bharucha

Fowler

Moortgat‐Pick

et al. 2013

J. High Energ. Phys.

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Abstract:We extend the formalism developed in ref. [53] for the renormalisation of the chargino-neutralino sector to the most general case of the MSSM with complex parameters. We show that products of imaginary parts arising from MSSM parameters and from absorptive parts of loop integrals can already contribute to predictions for physical observables at the one-loop level, and demonstrate that the consistent treatment of such contributions gives rise to non-trivial structure, either in the field renormalisation constants or the corrections associated with the external legs of the considered diagrams. We furthermore point out that the phases of the parameters in the chargino-neutralino sector do not need to be renormalised at the one-loop level, and demonstrate that the appropriate choice for the mass parameters used as input for the on-shell conditions depends both on the process and the region of MSSM parameter space under consideration. As an application, we compute the complete one-loop results in the MSSM with complex parameters for the process h a →χ + iχ − j (Higgs-propagator corrections have been incorporated up to the two-loop level), which may be of interest for SUSY Higgs searches at the LHC, and for chargino pair-production at an e + e − Linear Collider, e + e − →χ + iχ − j . We investigate the dependence of the theoretical predictions on the phases of the MSSM parameters, analysing in particular the numerical relevance of the absorptive parts of loop integrals.

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Section: Jhep05(2013)053mentioning

confidence: 99%

Consistent on shell renormalisation of electroweakinos in the complex MSSM: LHC and LC predictions

Bharucha

Fowler

Moortgat‐Pick

et al. 2013

J. High Energ. Phys.

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“…[33] the process e + e − →χ ± cχ ∓ c (c = c ) has been computed in the cMSSM (including "selected box contributions") and extended to the full contributions in Refs. [34,35]. We performed a comparison with Ref.…”

Section: Comparisonsmentioning

confidence: 99%

“…[33] (including "selected box contributions") and extended to the full contributions in Refs. [34,35]. Vertex corrections to e + e − → χ ± cχ ∓ c in the rMSSM including the contributions of t/t/b/b were evaluated in Ref.…”

Section: Introductionmentioning

confidence: 99%

Chargino and neutralino production at $$e^+e^-$$ e + e - colliders in the complex MSSM: a full one-loop analysis

Heinemeyer

Schappacher²

2017

Eur. Phys. J. C

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For the search for charginos and neutralinos in the Minimal Supersymmetric Standard Model (MSSM) as well as for future precision analyses of these particles an accurate knowledge of their production and decay properties is mandatory. We evaluate the cross sections for the chargino and neutralino production at e + e − colliders in the MSSM with complex parameters (cMSSM). The evaluation is based on a full one-loop calculation of the production mechanisms e + e − →χ ± cχ ∓ c and e + e − →χ 0 nχ 0 n including soft and hard photon radiation. We mostly restricted ourselves to a version of our renormalization scheme which is valid for |M 1 | < |M 2 |, |μ| and M 2 = μ to simplify the analysis, even though we are able to switch to other parameter regions and correspondingly different renormalization schemes. The dependence of the chargino/neutralino cross sections on the relevant cMSSM parameters is analyzed numerically. We find sizable contributions to many production cross sections. They amount to roughly ±15% of the tree-level results but can go up to ±40% or higher in extreme cases. Also the complex phase dependence of the one-loop corrections was found non-negligible. The full one-loop contributions are thus crucial for physics analyses at a future linear e + e − collider such as the ILC or CLIC.

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CP observables with spin–spin correlations in chargino production

et al. 2008

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We study the CP-violating terms of the spin-spin correlations in chargino production e + e − →χ ± 1χ ∓ 2 , and their subsequent two-body decays into sneutrinos plus leptons. We propose novel CP-sensitive observables with the help of T-odd products of the spin-spin terms. These terms depend on the polarizations of both charginos, with one polarization perpendicular to the production plane. We identify two classes of CP-sensitive observables; one requires the reconstruction of the production plane, the other not. Our framework is the Minimal Supersymmetric Standard Model with complex parameters. Cross sectionChargino production e + e − →χ + iχ − j proceeds via γ, Z exchange in the s-channel, and ν exchange in the t-channel, see the Feynman diagrams in Fig. 1. The γ exchange vanishes for non-diagonal chargino production e + e − →χ ± 1χ ∓ 2 . For diagonal chargino

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CPViolation in Unpolarizede+e−→Charginos at One-Loop Level

Cited by 12 publications

References 57 publications

Consistent on shell renormalisation of electroweakinos in the complex MSSM: LHC and LC predictions

Consistent on shell renormalisation of electroweakinos in the complex MSSM: LHC and LC predictions

Chargino and neutralino production at $$e^+e^-$$ e + e - colliders in the complex MSSM: a full one-loop analysis

CP observables with spin–spin correlations in chargino production

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